Hi Jim,

Thanks for your reply, I am aware of stepper motor brakes etc... however in this application it is needed on the bearing / housing around the bearing itself, I was looking at electromagnets like the one you suggest however am not actually sure how I could apply it, what would it actually pull towards. If it was just a steel plate on the side, the linear bearing would still be able to move upwards and downwards. If you then had a series of steel plates as part of the frame around the linear rod, it would not allow for the exact position of the linear bearing to be kept, instead just locked to one of the plates.